| rubidium(noun, element) | |
| ruthenium(noun, element) | |
| samarium(noun, element) | |
| scandium(noun, element) | |
| sodium(noun, element) | |
| strontium(noun, element) | |
| sulfur(noun, element) | |
| tantalum(noun, element) | |
| technetium(noun, element) | |
| terbium(noun, element) | |
| thallium(noun, element) | |
| thorium(noun, element) | |
| thulium(noun, element) | |
| tin(noun, element) | |
| titanium(noun, element) | |
| tungsten(noun, element) | |
| unreactive gas | |
| uranium(noun, element) | |
| vanadium(noun, element) | |
| vapor(noun, gas) |
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| APA | Smart Define. (2015). helium thesaurus. Retrieved September 25, 2026, from https://smartdefine.org/helium/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "helium thesaurus" https://smartdefine.org/helium/thesaurus/synonyms (accessed September 25, 2026). |
| Harvard | Smart Define 2015, helium thesaurus, Smart Define, viewed 25 September, 2026, <https://smartdefine.org/helium/thesaurus/synonyms>. |
| MLA | Smart Define. "helium thesaurus" 14 April 2015. Web. 25 September 2026. <https://smartdefine.org/helium/thesaurus/synonyms> |